It is currently an essential research direction to develop a low-cost, cost-effective, and environmentally friendly high-performance flexible electrode material. The electrode materials prepared from TiCT MXene based hydrogels showed favorable physical and chemical properties (e.g., extreme flexibility, excellent mechanical strength, and electrical conductivity), and CoS (cobaltous sulfide) nanoparticles were grown by in-situ hydrothermal growth on the “accordion-like” TiCT MXene surfaces, which were then synthesised into PCCT (PAA/chitosan/CoS/TiCT) conductive hydrogels with physical crosslinked networks in a two-step process. This 3D porous structure containing highly conductive materials can provide suitable geometrical space and electronic structure, which can help to suppress the accumulation of active material at high mass loading and improve the specific capacitance of the electrode material. With a current density of 4 mA/g, the specific capacitance of the PCCT conductive hydrogel electrode was 3.6F/g. At a current density of 10 mA/g, the cycling stability was still 80 % after 2000 cycles. The elongation at break of PCCT conductive hydrogel wass about 349 %. After 48 h of healing at room temperature, the self-healing efficiency can reach 66.88 %. A foundation has been laid for obtaining flexible all-solid-state supercapacitors with stable structures and excellent electrochemical properties.

中文翻译：

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新型CoS/Ti3C2TX MXene导电填料有效提高全固态超级电容器导电水凝胶电极材料的赝电容性能

开发低成本、高性价比、环境友好的高性能柔性电极材料是当前重要的研究方向。由 TiCT MXene 基水凝胶制备的电极材料表现出良好的物理和化学性质（例如，极高的柔韧性、优异的机械强度和导电性），并且通过在“手风琴-”上原位水热生长来生长 CoS（硫化钴）纳米颗粒。像“TiCT MXene 表面，然后通过两步过程将其合成为具有物理交联网络的 PCCT（PAA/壳聚糖/CoS/TiCT）导电水凝胶。这种含有高导电材料的3D多孔结构可以提供合适的几何空间和电子结构，有助于抑制高质量负载下活性材料的积累，提高电极材料的比电容。在电流密度为4 mA/g时，PCCT导电水凝胶电极的比电容为3.6F/g。在10mA/g电流密度下，循环2000次后循环稳定性仍为80%。 PCCT导电水凝胶的断裂伸长率约为349%。室温愈合48 h后，自愈效率可达66.88%。为获得结构稳定、电化学性能优异的柔性全固态超级电容器奠定了基础。